package com.lagou.rpc.consumer.proxy;

import com.alibaba.fastjson.JSON;
import com.lagou.rpc.common.RpcRequest;
import com.lagou.rpc.common.RpcResponse;
import com.lagou.rpc.consumer.client.RpcClient;
import com.lagou.rpc.consumer.client.RpcClientFactory;
import com.lagou.rpc.consumer.client.RpcClientForZk;
import com.lagou.rpc.consumer.config.RpcAddr;
import lombok.Data;

import java.lang.reflect.Proxy;
import java.util.List;
import java.util.UUID;
import java.util.concurrent.atomic.AtomicInteger;

/**
 * 客户端代理类-创建代理对象
 * 1.封装request请求对象
 * 2.创建RpcClient对象
 * 3.发送消息
 * 4.返回结果
 */
@Data
public class RpcClientProxy {

    private List<RpcAddr> addrs;
    private RpcClientFactory rpcClientFactory;
    private RpcClientForZk rpcClientForZk;

    private final AtomicInteger count = new AtomicInteger();


    public Object createProxy(Class serviceClass) {
        return Proxy.newProxyInstance(Thread.currentThread().getContextClassLoader(),
                new Class[]{serviceClass}, (proxy, method, args) -> {
                    //1.封装request请求对象
                    RpcRequest rpcRequest = new RpcRequest();
                    rpcRequest.setRequestId(UUID.randomUUID().toString());
                    rpcRequest.setClassName(method.getDeclaringClass().getName());
                    rpcRequest.setMethodName(method.getName());
                    rpcRequest.setParameterTypes(method.getParameterTypes());
                    rpcRequest.setParameters(args);
                    //2.创建RpcClient对象
                    //轮询
                    RpcAddr rpcAddr = rpcClientFactory.get();
                    RpcClient rpcClient = new RpcClient(rpcAddr.getHost(), rpcAddr.getPort());
                    try {
                        //3.发送消息
                        Object responseMsg = rpcClient.send(JSON.toJSONString(rpcRequest));
                        RpcResponse rpcResponse = JSON.parseObject(responseMsg.toString(), RpcResponse.class);
                        if (rpcResponse.getError() != null) {
                            throw new RuntimeException(rpcResponse.getError());
                        }
                        //4.返回结果
                        Object result = rpcResponse.getResult();
                        return JSON.parseObject(result.toString(), method.getReturnType());
                    } catch (Exception e) {
                        throw e;
                    } finally {
                        rpcClient.close();
                    }
                });
    }

}
